Purchase price of real property--Special or vendor's lien.
Agreement for purchase of real property--Payment of part of purchase price--Special or
vendee's lien for amount paid.
Validity of liens of vendors and vendees--Exception.
Written contract by buyer of real property for payment of purchase price to seller--Transfer of contract by seller waives lien to extent of sum payable under contract--Exception.
Lien on personal property for purchase price--Enforcement.